EP0671599B1 - Verfahren und pneumatisches Messwerkzeug zur Überwachung von Abmessungen eines Werkstückes - Google Patents
Verfahren und pneumatisches Messwerkzeug zur Überwachung von Abmessungen eines Werkstückes Download PDFInfo
- Publication number
- EP0671599B1 EP0671599B1 EP95102953A EP95102953A EP0671599B1 EP 0671599 B1 EP0671599 B1 EP 0671599B1 EP 95102953 A EP95102953 A EP 95102953A EP 95102953 A EP95102953 A EP 95102953A EP 0671599 B1 EP0671599 B1 EP 0671599B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- restrictor
- pressure
- input
- workpiece
- pressure difference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B33/00—Honing machines or devices; Accessories therefor
- B24B33/06—Honing machines or devices; Accessories therefor with controlling or gauging equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B13/00—Measuring arrangements characterised by the use of fluids
- G01B13/02—Measuring arrangements characterised by the use of fluids for measuring length, width or thickness
Definitions
- a relative measurement is carried out by the pressure difference between a measuring point at which the pre-throttle with line connecting the measuring nozzle and another measuring point is determined on a reference line parallel to the aforementioned line between a further choke and one arranged in series Reference nozzle is arranged.
- the reference nozzle is dimensioned that pressure equilibrium occurs at the differential pressure sensor when the workpiece the desired dimension, for example a desired one Bore diameter. Different dimensions of the workpiece lead to a target distance between the measuring nozzle and workpiece surface a reduced distance or an enlarged Distance occur. In the former case, the workpiece still has to go through Material removal can be reworked. In the latter case it became too much Material removed.
- the sign of the Differential pressure sensor reversible clearly occurring pressure difference with the sign of the dimensional deviation of the workpiece from the nominal size coupled.
- the amount of the pressure difference is only one Dimensional deviation of the workpiece analogous dimension if the pneumatic The pressure on the inlet side of the pre-throttles remains constant.
- certain pressure fluctuations can be expected. But that can from the size of the pressure difference occurring at the differential pressure sensor the size of the dimensional deviation cannot be concluded. aggravating Added to this is the fact that the pneumatic Pressure upstream of the chokes or even if the pneumatic fails Pressure source at the differential pressure sensor pressure equality occurs and simulates an exact dimensional accuracy of the workpiece.
- the invention relates to a method and a pneumatic measuring tool for monitoring the dimensions of a workpiece according to the generic term of claim 1 or the preamble of claim 5.
- Such a method and such a measuring tool are known from US-A-2 621 511 known.
- this known device there is a pressure sensor connected before and after the pre-choke. How in particular from column 3, lines 9 to 15, is used to determine a dimensional deviation of a workpiece by means of the pressure sensor 8 the input pressure in front of the pre-choke to a desired size and over the adjustable throttle 12 the second pressure sensor 13 in the measuring nozzle 11 used standard tool 14 adjusted to "0".
- the US-A-4,122,703 relates to a pneumatic measuring device are monitored with which threads or yarns.
- a pneumatic amplifier is connected between the pre-throttle and the measuring nozzle, which is actuated via the counterpressure of the measuring nozzle in order to stop the thread movement if the thread deviates from the norm or to take another measure.
- An exact pressure measurement does not take place here.
- the inlet pressure is also kept constant here and there is no precise determination of the dimensional deviation of the measured object.
- DE-OS 1623 324 relates to a method and an apparatus for Monitoring a relative movement between two objects (see for example Page 6, first paragraph). According to page 8, second Paragraph maintain a helium gas supply at constant pressure.
- GB-A-674 182 is essentially the same as US-A-2 621 511.
- the first pressure sensor in connection with a valve 2 is used to set a constant pressure (see in particular Page 2, lines 20 to 28), and the dimensional deviation on the second pressure sensor is read.
- the invention has for its object a method and a device of the type mentioned above, which do not have these disadvantages exhibit.
- the pneumatic Pressure before or after the pre-throttle and the pressure drop at the pre-throttle the dimensional deviation of the workpiece can be determined immediately, without a constant inlet pressure being required or set should be.
- the pressure drop at the pre-throttle can be used the device according to the invention either directly with a Input connected in front and the other input behind the pre-throttle Differential pressure sensor can be determined, or from the difference of the pressure values measured by two differential pressure sensors, each with one end in atmosphere as well as one with the other end in front and the other one is connected behind the pre-choke.
- the pressure drop at the pre-throttle is then converted into a dimensional deviation implemented, taking the determined inlet pressure into account in the calculation to compensate for pressure fluctuations.
- the method according to the invention and the device according to the invention are characterized by high measuring accuracy, simple Operation and a simple structure.
- the invention is based on the general idea that by Arrangement of the sensors according to the invention ultimately that of the measuring nozzle used pneumatic power can be determined, which in turn with the throttle resistance of the measuring nozzle and accordingly with the dimensions of the workpiece changes analog. But that can be done the pneumatic pressure upstream of the throttle and the pressure drop the pre-throttle immediately determines the dimensional deviation of the workpiece become.
- the differential pressure sensors can be used to switch off any measurement errors be connected to an evaluation unit, the determined pressure differences immediately in a display of the dimensional deviations of the workpiece implements.
- a particular advantage of the invention is that the Function of the pneumatic pressure source inevitably monitored and accordingly interruptions of the pneumatic The pressure supply does not lead to any measuring errors can.
- the only figure shows a circuit diagram Representation of the measuring tool according to the invention.
- a pneumatic pressure source 1 is via a filter unit 2, in which the generated compressed air is cleaned and in particular is freed from oil with the receipt of a Pre-throttle 3 connected to the output side with measuring nozzles 4 is connected in a tool head 5.
- Differential pressure sensors 9 and 10 arranged, with which the pneumatic overpressure at measuring points 7 and 8 relative to the atmosphere.
- the signals from the differential pressure sensors 9 and 10 become an evaluation unit 11 fed, which controls a display 12.
- the evaluation unit 11 determines from the signals of the Differential pressure sensors 9 and 10 on the one hand the pneumatic Overpressure at measuring point 7 and on the other hand the pressure drop between measuring points 7 and 8, i.e. the pressure drop the pre-throttle 3. From these measured values can then - after appropriate calibration - directly on the workpiece 6 Dimension to be monitored - here the gap width mentioned above - determined and displayed.
- One of the differential pressure sensors 9 and 10 can also to be replaced by a differential pressure sensor 10 ', which is directly the pressure difference between the Measuring points 7 and 8, i.e. the pressure drop at the pre-throttle 3, determined.
- the choke 3 and the Differential pressure sensors 9 and 10 or 10 'and the associated Measuring points 7 and 8 can be in or on a common Housing block 13 may be arranged, which with connections 14 and 15 for the outlet of pressure source 1 and the filter unit 2 and the pneumatic input of the Tool head 5 is provided.
- the measuring nozzles 4 are arranged on a tool head 5 are, the measuring nozzles on a separate Measuring head may be arranged. So far with the measuring head Inner diameter of a hole or the like. be checked the measuring head e.g. a measuring pin. If one Outside diameter to be determined is the measuring head trained like a ring. The measuring nozzles 4 are directed towards the workpiece.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Arrangements Characterized By The Use Of Fluids (AREA)
- Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
Description
Claims (8)
- Verfahren zur Überwachung von Abmessungen eines Werkstückes (6), bei welchem das Werkstück (6) mittels einer in Reihe hinter einer Vordrossel (3) angeordneten Meßdüse (4) pneumatisch beaufschlagt wird, wobei die Meßdüse (4) derart angeordnet wird, daß sie einen mit Abmessungen des Werkstückes (6) veränderlichen Drosselwiderstand aufweist und den einen Drucksensor (10) beaufschlagenden pneumatischen Druck zwischen Vordrossel (3) und Meßdüse (4) entsprechend verändert,
dadurch gekennzeichnet, daß der pneumatische Überdruck relativ zur Atmosphäre vor oder hinter der Vordrossel (3) sowie der Druckabfall an der Vordrossel (3) mittels zwei Differenzdrucksensoren (9, 10, 10') ermittelt und mittels einer Auswerteeinheit (11) aus diesen Daten die Maßabweichung des Werkstückes (6) bestimmt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß vor und hinter der Vordrossel (3) der pneumatische Überdruck zur Atmosphäre mittels je eines Differenzdrucksensors (9, 10) ermittelt und aus der Differenz der ermittelten Druckwerte der Druckabfall an der Vordrossel (3) bestimmt wird. - Verfahren nach Anspruch 1,
dadurch gekennzeichnet, daß der pneumatische Überdruck relativ zur Atmosphäre vor oder hinter der Vordrossel (3) mittels eines ersten Differenzdrucksensors (9) und der Druckabfall an der Vordrossel (3) mittels eines mit seinem einen Eingang vor der Vordrossel (3) und seinem anderen Eingang hinter der Vordrossel (3) angeschlossenen zweiten Differenzdrucksensors (10') ermittelt wird. - Verfahren nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Signale der Differenzdrucksensoren (9, 10, 10') einer elektronischen Auswerteeinheit (11) zugeführt werden, die eine Meßanzeige (12) steuert. - Pneumatisches Meßwerkzeug zur Überwachung von Abmessungen eines Werkstückes (6) mit einer in Reihe hinter einer Vordrossel (3) angeordneten, das Werkstück (6) pneumatisch beaufschlagenden Meßdüse (4), die derart angeordnet ist, daß sie einen mit Abmessungen des Werkstückes (6) veränderlichen Drosselwiderstand aufweist und den einen Drucksensor (10) beaufschlagenden pneumatischen Druck zwischen Vordrossel (3) und Meßdüse (4) entsprechend verändert, und mit zwei vom pneumatischen Druck beaufschlagten Drucksensoren, von denen ein erster Drucksensor (9) mit einem Eingang vor der Vordrossel (3) und ein zweiter Drucksensor (10, 10') mit einem Eingang hinter der Vordrossel (3) angeschlossen ist,
dadurch gekennzeichnet, daß die Drucksensoren (9, 10, 10') als Differenzdrucksensoren ausgebildet sind,
daß der zweite Eingang beider Differenzdrucksensoren (9, 10) an Atmosphäre oder der zweite Eingang eines Differenzdrucksensors (9) an Atmosphäre und des anderen Differenzdrucksensors (10') an die jeweils andere Seite der Vordrossel (3) angeschlossen ist und daß eine Auswerteeinheit (11) vorgesehen ist, durch welche aus dem pneumatischen Überdruck relativ zur Atmosphäre vor oder hinter der Vordrossel (3) und dem Druckabfall an der Vordrossel (3) die Maßabweichung des Werkstückes (6) ermittelbar ist. - Meßwerkzeug nach Anspruch 5,
dadurch gekennzeichnet, daß vor und hinter der Vordrossel (3) je ein Differenzdrucksensor (9, 10) mit seinem einen Eingang angeschlossen ist, dessen anderer Eingang an die Atmosphäre angeschlossen ist. - Meßwerkzeug nach Anspruch 5,
dadurch gekennzeichnet, daß vor oder hinter der Vordrossel (3) ein erster Differenzdrucksensor (9) mit seinem Eingang angeschlossen ist, welcher mit seinem anderen Eingang an die Atmosphäre angeschlossen ist, und daß ein weiterer Differenzdrucksensor (10') mit seinem einen Eingang vor und mit seinem anderen Eingang hinter der Vordrossel (3) angeschlossen ist. - Meßwerkzeug nach einem der Ansprüche 5 bis 7,
dadurch gekennzeichnet, daß die Signalausgänge der Differenzdrucksensoren (9, 10, 10') an eine elektronische Auswerteeinheit (11) angeschlossen sind, die mit einer Meßanzeige (12) verbunden ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4407159A DE4407159A1 (de) | 1994-03-04 | 1994-03-04 | Pneumatisches Meßwerkzeug zur Überwachung von Abmessungen eines Werkstückes |
DE4407159 | 1994-03-04 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0671599A2 EP0671599A2 (de) | 1995-09-13 |
EP0671599A3 EP0671599A3 (de) | 1998-05-27 |
EP0671599B1 true EP0671599B1 (de) | 2003-09-17 |
Family
ID=6511818
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95102953A Expired - Lifetime EP0671599B1 (de) | 1994-03-04 | 1995-03-02 | Verfahren und pneumatisches Messwerkzeug zur Überwachung von Abmessungen eines Werkstückes |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0671599B1 (de) |
DE (2) | DE4407159A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101952685B (zh) * | 2008-01-25 | 2013-03-06 | 马波斯有限公司 | 用于对工件进行几何测量的装置和方法 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19733984A1 (de) * | 1997-08-06 | 1999-02-11 | Stotz Feinmesstechnik Gmbh | Verfahren zur pneumatischen Längenmessung |
DE10239079B4 (de) * | 2002-08-26 | 2005-02-24 | Rexroth Mecman Gmbh | Pneumatische Auflagenkontrolleinrichtung mit einem Differenzdrucksensor |
DE102008007419A1 (de) * | 2008-01-25 | 2009-07-30 | Basar Gmbh | Vorrichtung und Verfahren zur Geometriemessung an einem Werkstück und Verfahren zur Herstellung einer solchen Vorrichtung |
DE102008010337A1 (de) * | 2008-02-14 | 2009-10-29 | Basar Gmbh | Vorrichtung und Verfahren zur Geometriemessung an einem Werkstück |
CN107796350A (zh) * | 2016-08-30 | 2018-03-13 | 天津市威泰五金制品有限公司 | 一种g型材检具 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2621511A (en) * | 1947-12-20 | 1952-12-16 | Fafnir Bearing Co | Pneumatic gauging device |
GB674182A (en) * | 1949-10-07 | 1952-06-18 | George Wilfrid Acland Green | Improvements in or relating to pneumatic comparator gauges |
DE1623324A1 (de) * | 1967-10-17 | 1971-04-15 | Atomic Energy Authority Uk | Vorrichtung fuer pneumatische Eichung oder Masskontrolle |
US3792605A (en) * | 1972-03-20 | 1974-02-19 | Bendix Corp | Method and circuit for fluid pressure gaging |
US4122703A (en) * | 1976-11-24 | 1978-10-31 | Davis Jesse B | Method and apparatus for reeling discrete yarn strand patterns |
-
1994
- 1994-03-04 DE DE4407159A patent/DE4407159A1/de not_active Withdrawn
-
1995
- 1995-03-02 EP EP95102953A patent/EP0671599B1/de not_active Expired - Lifetime
- 1995-03-02 DE DE59510795T patent/DE59510795D1/de not_active Expired - Fee Related
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101952685B (zh) * | 2008-01-25 | 2013-03-06 | 马波斯有限公司 | 用于对工件进行几何测量的装置和方法 |
Also Published As
Publication number | Publication date |
---|---|
EP0671599A2 (de) | 1995-09-13 |
EP0671599A3 (de) | 1998-05-27 |
DE4407159A1 (de) | 1995-09-07 |
DE59510795D1 (de) | 2003-10-23 |
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